Alima777 commented on a change in pull request #934: Delete dataTypeMapping etc 
fields in QueryPlan
URL: https://github.com/apache/incubator-iotdb/pull/934#discussion_r396986575
 
 

 ##########
 File path: 
server/src/main/java/org/apache/iotdb/db/query/dataset/AlignByDeviceDataSet.java
 ##########
 @@ -21,12 +21,16 @@
 import java.io.IOException;
 import java.util.ArrayList;
 import java.util.HashMap;
+import java.util.HashSet;
 import java.util.Iterator;
 import java.util.List;
 import java.util.Map;
 import java.util.Set;
 import org.apache.iotdb.db.exception.StorageEngineException;
+import org.apache.iotdb.db.exception.metadata.MetadataException;
 import org.apache.iotdb.db.exception.query.QueryProcessException;
+import org.apache.iotdb.db.metadata.MManager;
 
 Review comment:
   Fixed.

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